¡¾ Built-in USB Charge & Long-lasting Battery¡¿- Willful SW350 pedometer watch has a USB plug at the end of the host,just remove the bands and charge it with any USB port (no cable needed).One full charge gives you up to 7 days of working time.¡¾100% satisfaction¡¿- We offer 30 days full refund, 12 months warranty,life time technical support.